Spectral transitions of an ultraluminous X-Ray source, NGC 2403 Source 3

Naoki Isobe, Kazuo Makishima, Hiromitsu Takahashi, Tsunefumi Mizuno, Ryouhei Miyawaki, Poshak Gandhi, Madoka Kawaharada, Atsushi Senda, Tessei Yoshida, Aya Kubota, Hiroshi Kobori

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A Suzaku observation of an ultraluminous X-ray source, NGC 2403 Source 3, performed on 2006 March 16-17, is reported. The Suzaku XIS spectrum of Source 3 was described as multi-color black-body-like emission from an optically thick accretion disk. The innermost disk temperature and radius were measured to be T in = 1.08 +0.02 -0.03keV andR in = 122.11 +7.7 -6.8α 1/2km, respectively, where α = (cos 60°/cosi) with i being the disk inclination. Its bolometric luminosity was estimated to be L bol = 1-82 × 10 39α erg s -1. Archival Chandra and XMM-Newton data of the source were analyzed. In almost all observations, the source showed multi-color black-body-like X-ray spectra with parameters similar to those of the Suzaku observation. In only one Chandra observation, however, Source 3 exhibited a power-law-like spectrum, with a photon index of Γ = 2.37 ±0.08, when it was fainter by ̃ 15% than in the Suzaku observation. This behavior is explained in terms of a transition between a slim-disk state and "very high" states, both found in Galactic black hole binaries, when their luminosity apporached the Eddington limit. These results are utilized to argue that ultraluminous X-ray sources generally have significantly higher masses than ordinary stellar-mass black holes.

Original languageEnglish
JournalPublications of the Astronomical Society of Japan
Volume61
Issue numberSUPPL. 1
Publication statusPublished - 2009

Fingerprint

x rays
erg
power law
accretion
luminosity
color
XMM-Newton telescope
stellar mass
accretion disks
newton
inclination
temperature
radii
photons
index
parameter

Keywords

  • Accretion
  • Accretion disks
  • Black hole physics
  • Galaxies: Individual (NGC 2403)
  • X-rays: Galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Isobe, N., Makishima, K., Takahashi, H., Mizuno, T., Miyawaki, R., Gandhi, P., ... Kobori, H. (2009). Spectral transitions of an ultraluminous X-Ray source, NGC 2403 Source 3. Publications of the Astronomical Society of Japan, 61(SUPPL. 1).

Spectral transitions of an ultraluminous X-Ray source, NGC 2403 Source 3. / Isobe, Naoki; Makishima, Kazuo; Takahashi, Hiromitsu; Mizuno, Tsunefumi; Miyawaki, Ryouhei; Gandhi, Poshak; Kawaharada, Madoka; Senda, Atsushi; Yoshida, Tessei; Kubota, Aya; Kobori, Hiroshi.

In: Publications of the Astronomical Society of Japan, Vol. 61, No. SUPPL. 1, 2009.

Research output: Contribution to journalArticle

Isobe, N, Makishima, K, Takahashi, H, Mizuno, T, Miyawaki, R, Gandhi, P, Kawaharada, M, Senda, A, Yoshida, T, Kubota, A & Kobori, H 2009, 'Spectral transitions of an ultraluminous X-Ray source, NGC 2403 Source 3', Publications of the Astronomical Society of Japan, vol. 61, no. SUPPL. 1.
Isobe N, Makishima K, Takahashi H, Mizuno T, Miyawaki R, Gandhi P et al. Spectral transitions of an ultraluminous X-Ray source, NGC 2403 Source 3. Publications of the Astronomical Society of Japan. 2009;61(SUPPL. 1).
Isobe, Naoki ; Makishima, Kazuo ; Takahashi, Hiromitsu ; Mizuno, Tsunefumi ; Miyawaki, Ryouhei ; Gandhi, Poshak ; Kawaharada, Madoka ; Senda, Atsushi ; Yoshida, Tessei ; Kubota, Aya ; Kobori, Hiroshi. / Spectral transitions of an ultraluminous X-Ray source, NGC 2403 Source 3. In: Publications of the Astronomical Society of Japan. 2009 ; Vol. 61, No. SUPPL. 1.
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AU - Isobe, Naoki

AU - Makishima, Kazuo

AU - Takahashi, Hiromitsu

AU - Mizuno, Tsunefumi

AU - Miyawaki, Ryouhei

AU - Gandhi, Poshak

AU - Kawaharada, Madoka

AU - Senda, Atsushi

AU - Yoshida, Tessei

AU - Kubota, Aya

AU - Kobori, Hiroshi

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N2 - A Suzaku observation of an ultraluminous X-ray source, NGC 2403 Source 3, performed on 2006 March 16-17, is reported. The Suzaku XIS spectrum of Source 3 was described as multi-color black-body-like emission from an optically thick accretion disk. The innermost disk temperature and radius were measured to be T in = 1.08 +0.02 -0.03keV andR in = 122.11 +7.7 -6.8α 1/2km, respectively, where α = (cos 60°/cosi) with i being the disk inclination. Its bolometric luminosity was estimated to be L bol = 1-82 × 10 39α erg s -1. Archival Chandra and XMM-Newton data of the source were analyzed. In almost all observations, the source showed multi-color black-body-like X-ray spectra with parameters similar to those of the Suzaku observation. In only one Chandra observation, however, Source 3 exhibited a power-law-like spectrum, with a photon index of Γ = 2.37 ±0.08, when it was fainter by ̃ 15% than in the Suzaku observation. This behavior is explained in terms of a transition between a slim-disk state and "very high" states, both found in Galactic black hole binaries, when their luminosity apporached the Eddington limit. These results are utilized to argue that ultraluminous X-ray sources generally have significantly higher masses than ordinary stellar-mass black holes.

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